Crossword Genius

Extensive property (10)

Ross

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6

10

elasticity

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'property' is the definition.
(elasticity is a kind of property)

I don't understand how the rest of the clue works.

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(Other definitions for elasticity that I've seen before include "Springiness" , "Spring" , "Stretchiness" , "indication of how that may affect demand" .)

I've seen this clue in The Globe and Mail and The Guardian.
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